San Francisco 49ers defensive tackles Arik Armstead (foot, knee) and Javon Hargrave (hamstring) and linebacker Oren Burks (knee) have been ruled out for Sunday's game against the Arizona Cardinals. Meanwhile, linebacker Dre Greenlaw (ankle, hip) and cornerback Charvarius Ward (groin) are questionable to play. San Fran's interior defensive line will be a little more vulnerable this weekend against the Cardinals, but their defensive/special teams unit should still be considered a top-five play for...